when i tried to georeference a printout from map.geo.admin.ch, either the result got turned some degrees, or the height got compressed or both.
using the helmert transformation gave me the best results. the result was not compressed - only rotated.
the coordinates for the reference points i userd were taken from the coordinate grid on the website. i used the four corners. top left: 46.86851 9.99669 bottom left: 46.76063 9.99157 bottom right: 46.75528 10.22048 top right: 46.86315 10.22609
i tried it with a screenshot of google maps with the same results... is there a way to georeference that print without rotating it?